Gerald Schaefer 22338c5565 s390/mm: fix write access check in gup_huge_pmd() ...

commit ba385c0594 upstream.

The check for the _SEGMENT_ENTRY_PROTECT bit in gup_huge_pmd() is the
wrong way around. It must not be set for write==1, and not be checked for
write==0. Fix this similar to how it was fixed for ptes long time ago in
commit 25591b0703 ("[S390] fix get_user_pages_fast").

One impact of this bug would be unnecessarily using the gup slow path for
write==0 on r/w mappings. A potentially more severe impact would be that
gup_huge_pmd() will succeed for write==1 on r/o mappings.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-10-05 09:44:01 +02:00

..

cmm.c

s390: convert use of typedef ctl_table to struct ctl_table

2013-10-28 08:36:25 +01:00

dump_pagetables.c

s390/pgtable: get rid of _REGION3_ENTRY_RO

2016-06-13 15:58:14 +02:00

extmem.c

s390: Use pr_warn instead of pr_warning

2016-03-07 13:12:04 +01:00

fault.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2016-10-04 14:05:52 -07:00

gmap.c

s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs

2017-09-09 17:39:41 +02:00

gup.c

s390/mm: fix write access check in gup_huge_pmd()

2017-10-05 09:44:01 +02:00

hugetlbpage.c

s390/mm: use hugetlb_bad_size()

2016-10-17 11:25:26 +02:00

init.c

s390/mm: fix zone calculation in arch_add_memory()

2016-10-24 10:26:17 +02:00

maccess.c

s390/maccess: reduce stnsm instructions

2016-02-17 09:05:04 +01:00

Makefile

s390/extable: use generic search and sort routines

2016-03-22 15:36:02 -07:00

mem_detect.c

s390/mem_detect: use unsigned longs

2016-01-11 12:27:11 +01:00

mmap.c

mm: larger stack guard gap, between vmas

2017-06-24 07:11:18 +02:00

page-states.c

s390/mm: use basic block for essa inline assembly

2016-06-28 09:32:29 +02:00

pageattr.c

s390/mm: merge local / non-local IPTE helper

2016-08-24 09:23:55 +02:00

pgalloc.c

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2016-08-02 16:11:27 -04:00

pgtable.c

KVM: s390: Fix guest migration for huge guests resulting in panic

2017-03-18 19:14:34 +08:00

vmem.c

s390: add proper __ro_after_init support

2016-06-13 15:58:23 +02:00